Dell 1907FPf - Page 37

Service Manual
36
1. No Power & Power LED Off:
IIIIIIIIIIDDISI
Is there DC16V at L853?
Is the voltage at C854 in the
range of 127V~373V?
Is the voltage at pin3 of U850 18V?
Is the voltage at pin6 of U850 0.8V?
Is the voltage at pin9&pin10 of T850 38V?
Check D856
Check RT850, F850
Check R855
Check D852, D854
NO
YES
YES
YES
YES
NO
NO
NO
Is there DC 5V at L803
NO
YES
Check IF Board